Are they still using it? the current Digg is a whole new site rewritten from the ground up from betaworks I'm not seeing the toolbar at all.
Hmm it appears they killed it in 2010, though I still see some browser plugins available.
I'm not familiar with their toolbar. How does it scam Google?
It makes it look like you're still on Digg even when you click the a link to go to another site. So essentially it makes it look like people are spending a lot more time on Digg than they actually are.